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Browsing by Author "Ansmann, A."
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Hygroscopic properties and extinction of aerosol particles at ambient relative humidity in South-Eastern China
Eichler, H.; Cheng, Y. F.; Birmili, W.; Nowak, A.; Wiedensohler, A.; Brüggemann, E.; Gnauk, T.; Herrmann, H.; Althausen, D.; Ansmann, A.; Engelmann, R.; Tesche, Matthias; Wendisch, M.; Zhang, Y. H.; Hu, M.; Liu, S.; Zeng, L. M. (2008-08)During the "Program of Regional Integrated Experiments of Air Quality over Pearl River Delta 2004 (PRIDE-PRD2004)" hygroscopic properties of particles in the diameter range 22 nm to 10 μ m were determined. For that purpose, ... -
Ice formation in ash-influenced clouds after the eruption of the Eyjafjallajkull volcano in April 2010
Seifert, P.; Ansmann, A.; Gross, Silke; Freudenthaler, V.; Heinold, B.; Hiebsch, A.; Mattis, I.; Schmidt, J.; Schnell, F.; Tesche, Matthias; Wandinger, U.; Wiegner, M. (2011-10-27)The influence of volcanic ash on heterogeneous ice nucleation in tropospheric clouds is investigated on the basis of 90 observed cloud cases. The clouds were observed with polarization lidars at the two central-European ... -
Ice formation in Saharan dust over central Europe observed with temperature/humidity//aerosol Raman lidar
Ansmann, A.; Mattis, I.; Mueller, D.; Wandinger, U.; Radlach, M.; Althausen, D.; Damoah, R. (2005-04-26)[1] Three gravity-wave-induced clouds and a glaciating altocumulus layer were continuously monitored with lidar at Leipzig, Germany, on 21 November 2003. The midtropospheric clouds formed in Saharan dust at heights from ... -
Indo-Asian pollution during INDOEX : Microphysical particle properties and single-scattering albedo inferred from multiwavelength lidar observations
Mueller, D.; Franke, K.; Ansmann, A.; Althausen, D.; Wagner, F. (2003-10-07)[1] We present for the first time a comprehensive data set of vertically resolved physical particle properties, and the single-scattering albedo at 532 nm, derived from multiwavelength lidar observations of pollution plumes ... -
Influence of Saharan dust on cloud glaciation in southern Morocco during the Saharan Mineral Dust Experiment
Ansmann, A.; Tesche, Matthias; Althausen, D.; Mueller, D.; Seifert, P.; Freudenthaler, V.; Heese, B.; Wiegner, M.; Pisani, G.; Knippertz, P.; Dubovik, O. (2008-02-27)Multiwavelength lidar, Sun photometer, and radiosonde observations were conducted at Ouarzazate ( 30.9 degrees N, 6.9 degrees W, 1133 m above sea level, asl), Morocco, in the framework of the Saharan Mineral Dust Experiment ... -
An intercomparison of aerosol light extinction and 180 degrees backscatter as derived using in situ instruments and Raman lidar during the INDOEX field campaign
Masonis, S.J.; Franke, K.; Ansmann, A.; Mueller, D.; Althausen, D.; Ogren, J.A.; Jefferson, A.; Sheridan, P.J. (2002)[1] Aircraft in situ and Raman lidar profiles of aerosol light extinction (sigma(ep)) and 180degrees backscattering (beta(p)) are compared for 6 days during the Indian Ocean Experiment (INDOEX). The measurements of sigma(ep) ... -
Lidar profiling of aerosol optical and microphysical properties from space : Overview, review, and outlook
Ansmann, A.; Mueller, D.; Wandinger, U.; Mamouri, R.E. (SPIE, 2013)The potential of spaceborne lidar to monitor aerosol layering and mixing with high vertical resolution is reviewed. An overview is presented on aerosol lidar techniques of past, present, and future NASA and ESA lidar ... -
Long-range transport of Saharan dust to northern Europe : The 11-16 October 2001 outbreak observed with EARLINET
Ansmann, A.; Boesenberg, J.; Chaikovsky, A.; Comeron, A.; Eckhardt, S.; Eixmann, R.; Freudenthaler, Volker; Ginoux, P.; Komguem, L.; Linne, H.; Marquez, M.A.L.; Matthias, M.; Mattis, I.; Mitev, Valentin; Mueller, D.; Music, S.; Nickovic, S.; Pelon, J.; Sauvage, L.; Sobolewsky, P.; Srivastava, M.K.; Stohl, A.; Torres, O.; Vaughan, G.; Wandinger, U.; Wiegner, M. (2003-12-24)[1] The spread of mineral particles over southwestern, western, and central Europe resulting from a strong Saharan dust outbreak in October 2001 was observed at 10 stations of the European Aerosol Research Lidar Network ... -
Microphysical particle parameters from extinction and backscatter lidar data by inversion with regularization : experiment
Mueller, D.; Wagner, F.; Wandinger, U.; Ansmann, A.; Wendisch, M.; Althausen, D.; von Hoyningen-Huene, W. (2000-04-20)We present effective radius, volume, surface-area, and number concentrations as well as mean complex refractive index of tropospheric particle size distributions based on lidar measurements at six wavelengths. The parameters ... -
Microphysical particle parameters from extinction and backscatter lidar data by inversion with regularization: simulation
Mueller, D.; Wandinger, U.; Ansmann, A. (1999-04-20)A sensitivity study with an inversion scheme that permits one to retrieve physical parameters of tropospheric particle size distributions, e.g., effective radius, volume, surface-area, and number concentrations, as well ... -
Microphysical particle parameters from extinction and backscatter lidar data by inversion with regularization: theory
Mueller, D.; Wandinger, U.; Ansmann, A. (1999-04-20)A method is proposed that permits one to retrieve physical parameters of tropospheric particle size distributions, e.g., effective radius, volume, surface-area, and number concentrations, as well as the mean complex ... -
Mineral dust observed with AERONET Sun photometer, Raman lidar, and in situ instruments during SAMUM 2006 : Shape-dependent particle properties
Mueller, D.; Ansmann, A.; Freudenthaler, V.; Kandler, K.; Toledano, C.; Hiebsch, A.; Gasteiger, J.; Esselborn, M.; Tesche, Matthias; Heese, B.; Althausen, D.; Weinzierl, B.; Petzold, A.; von Hoyningen-Huene, W. (2010-06)Nearly pure Saharan dust was observed with an Aerosol Robotic Network (AERONET) Sun photometer, several Raman and high spectral resolution lidars, and airborne in situ instruments during the Saharan Mineral Dust Experiment ... -
Mineral dust observed with AERONET Sun photometer, Raman lidar, and in situ instruments during SAMUM 2006 : Shape-independent particle properties
Mueller, D.; Weinzierl, B.; Petzold, A.; Kandler, K.; Ansmann, A.; Mueller, T.; Tesche, Matthias; Freudenthaler, V.; Esselborn, M.; Heese, B.; Althausen, D.; Schladitz, A.; Otto, S.; Knippertz, P. (2010-04-10)Aerosol Robotic Network (AERONET) Sun photometer observations were carried out at Ouarzazate, Morocco, during the Saharan Mineral Dust Experiment (SAMUM) 2006. Data from one measurement day, 19 May 2006, are used to derive ... -
Multiwavelength Raman lidar observations of particle growth during long-range transport of forest-fire smoke in the free troposphere
Mueller, D.; Mattis, I.; Ansmann, A.; Wandinger, U.; Ritter, C.; Kaiser, D. (2007-03-02)We present particle effective radii and Angstrom exponents of aged free-tropospheric forest-fire smoke. The particle plumes were observed with different multiwavelength Raman lidars downwind of the fires that burned in ... -
Multiyear aerosol observations with dual-wavelength Raman lidar in the framework of EARLINET
Mattis, I.; Ansmann, A.; Mueller, D.; Wandinger, U.; Althausen, D. (2004-07-10)For the first time, a Raman lidar operating simultaneously in the ultraviolet (UV) and in the visible wavelength range was employed to measure vertical profiles of volume extinction coefficients of particles at 355 and 532 ... -
One-year observations of particle lidar ratio over the tropical Indian Ocean with Raman lidar
Franke, K.; Ansmann, A.; Mueller, D.; Althausen, D.; Wagner, F.; Scheele, R. (2001-12-15)Observations of the extinction-to-backscatter ratio (lidar ratio) of South and Southeast Asian aerosol particles are presented for the wavelength of 532 nm. Raman lidar measurements were performed in the Maldives (4.1 ... -
Optical and microphysical characterization of biomass-burning and industrial-pollution aerosols from multiwavelength lidar and aircraft measurements
Wandinger, U.; Mueller, D.; Boeckmann, C.; Althausen, D.; Matthias, M.; Bosenberg, J.; Weiss, A.; Fiebig, M.; Wendisch, M.; Stohl, A.; Ansmann, A. (2002-11-16)[1] During the Lindenberg Aerosol Characterization Experiment (LACE 98) simultaneous measurements with ground-based and airborne lidars and with two aircraft equipped with aerosol in situ instrumentation were performed. ... -
Optical properties of the Indo-Asian haze layer over the tropical Indian Ocean
Franke, K.; Ansmann, A.; Mueller, D.; Althausen, D.; Venkataraman, C.; Reddy, M.S.; Wagner, F.; Scheele, R. (2003-01)[1] Multiwavelength backscatter and extinction profiling was performed with a unique aerosol Raman lidar at Hulhule (4degreesN, 73degreesE), Maldives, as part of the Indian Ocean Experiment (INDOEX) between February 1999 ... -
Physical properties of the Indian aerosol plume derived from six-wavelength lidar observations on 25 March 1999 of the Indian Ocean Experiment
Mueller, D.; Wagner, F.; Althausen, D.; Wandinger, U.; Ansmann, A. (2000-05-01)A major pollution outbreak from the Indian subcontinent was observed with a six-wavelength aerosol lidar at Hulule island (4.1 degrees N, 73.3 degrees E) on 25 March 1999 during the Indian Ocean Experiment. From the observed ... -
Potential of lidar backscatter data to estimate solar aerosol radiative forcing
Wendisch, Manfred; Mueller, D.; Mattis, I.; Ansmann, A. (2006-02-01)The potential to estimate solar aerosol radiative forcing (SARF) in cloudless conditions from backscatter data measured by widespread standard lidar has been investigated. For this purpose 132 days of sophisticated ...